diff --git a/pkgs/development/libraries/itktcl/default.nix b/pkgs/development/libraries/itktcl/default.nix
index ecf2e306b1f..36503fc1add 100644
--- a/pkgs/development/libraries/itktcl/default.nix
+++ b/pkgs/development/libraries/itktcl/default.nix
@@ -15,8 +15,8 @@ stdenv.mkDerivation rec {
   configureFlags = [
     "--with-tcl=${tcl}/lib"
     "--with-tk=${tk}/lib"
-    "--with-tkinclude=${tk.dev}/include"
     "--with-itcl=${incrtcl}/lib"
+    "--with-tkinclude=${tk.dev}/include"
   ];
 
   postInstall = ''